ICHNEUMON-FLIES, PART 2'. EPHIALTINAE 351 



The genus Theronia is worldwide, Delomerista and Pseudorhyssa 

 Holarctic, and Atractogaster European. Below is a key to the genera 

 occurring in North America. 



Key to the Nearctic genera of Theroniini 



1. Abdomen polished; tarsal claws enlarged, each with an enlarged bristle with 



a spatulate tip: body color usually yellow or fulvous . 1. Theronia (p. 351) 



Abdomen strongly mat; tarsal claws not enlarged, without an enlarged 



bristle with a spatulate tip; body color black 2 



2. Clypeus without a median apical notch; nervellus broken at or below the 



middle 2. Delomerista (p. 362) 



Clypeus with a median apical tooth; nervellus broken far above the middle. 



3. Pseudorhyssa (p. 373) 



1. Genus Theronia 



Figure 299,b 



Theronia Holmgren, 1859, Ofvers. Svenska Vetensk.-Akad. Forh., vol. 16, p. 123. 



Type: (Pimpla flav leans Fabricius) =atalantac (Poda); monobasic. 

 Pseudacoenites Kriechbaumer, 1892, Ent. Nachr., vol. 18, p. 219. Type: (Pseuda- 



coenites moravicus Kriechbaumer) = laevigata (Tschek) ; monobasic. 

 Neotheronia Krieger, 1898, Sitz.-Ber. Naturf. Ges. Leipzig, vol. 14-15, p. 119. 



Type: Theronia lolteca Cresson; original designation. 

 Epimecoideus Ashmead, 1900, Proc. U. S. Nat. Mus., vol. 23, p. 52. Type: 



Epimecoideus apicalis Ashmead; original designation. 

 Poecilopimpla Cameron, 1903, Journ. Straits Branch of the Roy. Asiatic Soc, 



vol. 39, p. 141. New synonymy. Type: Poecilopimpla lucida Cameron; 



monobasic. 

 Erythrotheronia Cameron, 1905, Spolia Zeylanica, vol. 3, p. 134. Type: Erythro- 



theronia flavolineata Cameron; monobasic. 

 Orientotheronia Morley, 1913, Fauna of British India, including Burma and 



Ceylon, Hymenoptera, vol. 3, pt. 1, p. 116. Type: Orientotheronia rufescens 



Morley; original designation. 



Front wing 5 to 13 mm. long; body form moderately stout to rather 

 slender; apex of clypeus truncate or with a median notch, without a 

 pointed median apical tooth; propodeal carinae strong; tarsal claws 

 very large, simple, but with an enlarged bristle arising subbasally be- 

 low and extending to apex of claw, the tip of the bristle with a spatu- 

 late enlargement; nervellus broken far above the middle; abdomen 

 polished, its hairs usually sparse and arising from fine inconspicuous 

 punctures; ovipositor short to moderately long, cylindric, its sheath 

 usually about 0.45 as long as front wing. 



Poecilopimpla is synonymized with Theronia on the basis of the 

 original description. We have not seen the genotype. 



There are some rather well-defined groups within this genus, which 

 might be recognized as species groups or as subgenera, but since there 

 are only four Nearctic species, definitions of subgenera or species 

 groups is not attempted here. Of our four, the species bicincta and 



